A producer handles the business side of the production process, whereas the director handles the creative side. So a producer may hire the actor but the director will provide the monologues and lines. In addition to that, there may be more than one producer on a set while a director is usually just one. This is because the business of running a set is heavy and needs many producers to combine their efforts. However, many times, what the director does is hire an assistant director, who now communicates with the producers at all times. Sometimes the producer may offer creative ideas and the director may suggest how to run the set, however, their roles are very different and they do work well together most of the time.
